664633500 has 48 divisors (see below), whose sum is σ = 1935417120. Its totient is φ = 177235200.

The previous prime is 664633477. The next prime is 664633531. The reversal of 664633500 is 5336466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220045 + ... + 223044.

It is an arithmetic number, because the mean of its divisors is an integer number (40321190).

Almost surely, 2^664633500 is an apocalyptic number.

664633500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664633500 is an abundant number, since it is smaller than the sum of its proper divisors (1270783620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664633500 is a wasteful number, since it uses less digits than its factorization.

664633500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443111 (or 443099 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 33.

The square root of 664633500 is about 25780.4868068856. The cubic root of 664633500 is about 872.6914930683.

Adding to 664633500 its reverse (5336466), we get a palindrome (669969966).

The spelling of 664633500 in words is "six hundred sixty-four million, six hundred thirty-three thousand, five hundred".